给系统设置固定IP
定位到目录：
cd /etc/sysconfig/network-scripts
ifcfg-em1 ifdown-eth ifdown-ppp ifup ifup-ipv6 ifup-routes init.ipv6-global
ifcfg-em1.bak ifdown-ib ifdown-routes ifup-aliases ifup-isdn ifup-sit network-functions
ifcfg-em2 ifdown-ippp ifdown-sit ifup-bnep ifup-plip ifup-Team network-functions-ipv6
ifcfg-lo ifdown-ipv6 ifdown-Team ifup-eth ifup-plusb ifup-TeamPort
ifdown ifdown-isdn ifdown-TeamPort ifup-ib ifup-post ifup-tunnel
ifdown-bnep ifdown-post ifdown-tunnel ifup-ippp ifup-ppp ifup-wireless
vi 编辑 ifcfg-em1文件， 这个文件是对应网卡的脚本内容，直接修改：增加如下几项，包括IP地址，网关等等
IPADDR="192.168.2.6"
NETMASK="255.255.255.0"
GATEWAY="192.168.1.1"
NETWORK="192.168.1.0"
DNS1="192.168.1.1"
修改完成后，重启network
service network restart
ending...